COD, ammonia, nitrogen and total phosphorus three-in-one online analyzer

　　The COD, ammonia nitrogen and total phosphorus three-in-one online analyzer is a new generation of online analyzers that fully complies with standards and industry standards. One instrument can simultaneously measure the chemical oxygen demand (COD) in water, ammonia nitrogen and total phosphorus in water, and the online determination of the three pollution factors complies with current standards and industry requirements, saving users use costs.

　　The measurement principle of COD is based on the absorption of ultraviolet light by organic matter in water samples. The absorbance of ultraviolet light by water samples is measured by ultraviolet spectroscopy to directly determine the COD concentration in water samples. The online analyzer for ammonia nitrogen uses Nessler's reagent method or salicylic acid optical colorimetry, and its analysis process and results fully comply with the national standards and industry requirements of HJ536-2009 and HJ/T101-2003; the online analyzer for total phosphorus uses ammonium molybdate colorimetry: water samples and potassium persulfate are digested under ultraviolet light, and phosphorus-containing compounds in the water are oxidized into orthophosphates, and then react with ammonium molybdate and potassium antimony tartrate in an acidic medium to produce heteropolyacids, which react with ascorbic acid to produce blue substances, the color depth of which is proportional to the total phosphorus content in the water sample.

　　System Features

　　1. Simultaneously determine the chemical oxygen demand (COD) and ammonia nitrogen and total phosphorus content in water.

　　2. Three-in-one monitoring of COD, ammonia nitrogen and total phosphorus saves usage costs.

　　3. Flexible calibration of standard solutions ensures higher accuracy, far superior to general monitors.

　　4. Optical quantitative algorithm ensures high repeatability.

　　5. Flexible setting of response time ensures accurate monitoring of any water sample.

　　6. The syringe pump has a long service life and the syringe only needs to be replaced once every three years.

　　7. External sampling uses two methods: submersible pump and self-priming pump.

　　8. The online monitoring methods are diversified, which can realize manual measurement at any time, automatic timing measurement, automatic periodic measurement and other measurement methods.

　　9. Advanced self-diagnosis and alarm system, when the sample is suddenly interrupted, there is an alarm signal.

　　10. Simple operation and maintenance.

　　● Calibration method: automatic timing calibration or manual calibration.

　　● Pre-treatment maintenance: automatic cleaning or manual cleaning.

　　● Daily maintenance: Clean the filter of the external sampling pump every three months; clean the quantitative tube every six months or choose to replace the quantitative tube; replace the syringe and digestion tank every three years; replace the filter module in the pretreatment device once a year.

　　● Self-check system: self-monitoring of leaks; self-diagnosis of instrument status.